About the distance of infrared obstacle avoidance circuit

sky999

About the distance of infrared obstacle avoidance circuit [Copy link]

 

This is a circuit I found online. The test distance is less than 10CM. How can I increase the distance? I added an NPN transistor to the DO, but it didn't work. I then replaced the receiving tube with HS0038, but it didn't work.

chunyang

This circuit can only be used for short-range detection. How far do you want to go?

chunyang

As for HS0038, it is an integrated device of infrared photosensitive tube and front-end signal receiving and processing circuit, and cannot directly replace photosensitive tube. If you use HS0038 as photosensitive tube, there will be no output.

wangerxian

How far do you want to measure?

sky999

chunyang posted on 2022-6-20 17:54 This circuit can only be used for short-range detection. How far do you want?

I think the distance is 30CM

sky999

chunyang posted on 2022-6-20 17:58 As for HS0038, it is an integrated device of infrared photosensitive tube and front-end signal receiving and processing circuit, and cannot directly replace photosensitive tube. You regard HS0038 as photosensitive...

Isn't HS0038 output pin 1 positive, pin 2 negative, and pin 3 negative? I simply connected a PNP transistor to pin 3, and then connected an LED light, but there was no response.

sky999

wangerxian posted on 2022-6-20 18:15 How far do you want to measure?

I just want to increase the distance to 30CM

wangerxian

sky999 posted on 2022-6-20 19:20 I just want to increase the distance to 30CM

It is useless to change the transistor at DO, as DO should only output 0 and 1. Amplifying the voltage with a transistor will not change the output result.

HS0038 is an infrared remote control receiver, not an infrared ray receiver. If you really want to measure 30cm, go to Taobao and look at other sensors, or draw one yourself.

chunyang

sky999 posted on 2022-6-20 19:19 I think the distance is 30CM

The circuit of that poster is quite difficult, it requires high reflectivity, which ordinary materials cannot achieve.

chunyang

sky999 posted on 2022-6-20 19:19 Isn't HS0038 output on pin 1 positive, pin 2 negative, and pin 3? I simply connected a PNP transistor to pin 3, and then connected an LED light, but there was no response

As mentioned in the previous post, HS0038 and photosensitive tube are two different things. Go and take a look at the device manual of HS0038.

chunyang

Reflective infrared obstacle avoidance must increase the emission power of the infrared LED and the receiving sensitivity of the photosensitive tube, and an amplifier must be added.

sky999

chunyang posted on 2022-6-21 14:46 Reflective infrared obstacle avoidance must increase the transmission power of the infrared LED and the receiving sensitivity of the photosensitive tube, and an amplifier must be added.

Is there a triode added behind the receiving tube?

chunyang

sky999 posted on 2022-6-21 16:17 Is a triode added behind the receiving tube?

It's better to use an op amp.

sky999

chunyang posted on 2022-6-21 16:34 It is better to use an op amp.

Is it feasible to connect the receiving tube to LM358 through a triode?

sky999

chunyang posted on 2022-6-21 16:34 It is better to use an op amp.

I tried it, adding a transistor didn't work, and then I changed it to directly connecting to LM358, but it didn't work either, the maximum distance became 3CM

chunyang

sky999 posted on 2022-6-21 16:59 Is it feasible to connect the receiving tube to LM358 after passing through the triode?

Just use the op amp directly.

chunyang

sky999 posted on 2022-6-22 14:37 I tried it, adding a transistor didn't work, and changing it to directly connecting LM358 didn't work either, the maximum distance became 3CM

It depends on the specific circuit design.

sky999

chunyang posted on 2022-6-22 18:24 It depends on the specific circuit design.

Just change 393 to 358 in the picture above, the distance is only 3CM

chunyang

sky999 posted on 2022-6-22 22:08 Just change 393 to 358 in the picture above, the distance is only 3CM

That doesn't make any sense, first understand the main post circuit.